Higher leaf springs are the best option and higher springs are not necessarly stiffer, just have more curve set in them. Extended shackels and lift blocks are just piss poor shortcuts. I am not sold on the replacement UCA's as a lot of money for very little lift although some trucks may not get their wheel allignment within spec when lifted with origional UCA's. You can get a fair bit of lift out of the torsion adjustment. I fitted the medium toughdog springs anf foamcell shocks and wound up my stock torsion bars and got about 70mm lift because the stock stuff had sagged so much. The medium leaves flex well and arn't too harsh and winding the stock torsion bars up increased the height and spring rate and I have heard that aftermarket torsion bars can get harsh when wound up for extra lift, and the foamcell shocks work well not fading over corrigations and fast bouncy tracks and not too harsh on road. I think adjustable shocks are a gimmick for anything outside of motorsport and there is a miscoseption that you can adjust shocks to carry heavy loads which is bull as springs carry the load. Hope this helps you sort through all the options out there as those companies well try to sell all sorts of stuff and catch many people out with their spin, do heaps of research and ask heaps of questions before laying down your money. Also, send a PM to ZORDO on this forum, he sells suspension from home and he knows his stuff and is a fair dinkim bloke not a big company so won't try to sell you something you don't need.
Cheers